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### Topic: Bi Colour Led Matrix Problem (Read 2628 times)previous topic - next topic

#15
##### Mar 15, 2013, 08:01 pm
I suggest you probe the part as suggested in #6 then and determine the pin order.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

#### i_luv_arduino

#16
##### Mar 15, 2013, 08:59 pm
Any suggestions regarding the lone green lights?

#### Grumpy_Mike

#17
##### Mar 15, 2013, 09:09 pm

Any suggestions regarding the lone green lights?

Unless you can find out exactly what you have we can't tell you exactly what to do. You have to do your part and help us help you.

#18
##### Mar 15, 2013, 09:25 pm
You're going to have 8 red anode and 8 green anodes, and 8 common cathodes,
or,
8 red cathodes & 8 green cathodes, and 8 common anodes. You have to do some experimenting to determine what is where.
It is not hard.
Take 5V thru a resistor and a ground wire.
Touch them to two pins. Say pin 22 is Gnd to start - now touch the resistor to the other pins & see what lights up.
If you find a bunch, them you have a common cathode array (the rows in the picture below). Make a note of the low and which pins turn on for the anodes (the columns).
The pins that didn't have a light are likely other common cathodes. Move the Gnd to one of those, and what lights up.

If you don't find a bunch to start, switch the Gnd & resistor around, maybe you have a common anode part instead.
Be methodical,  it is not hard to figure out.

typical common cathode part

typical common anode part

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

#### i_luv_arduino

#19
##### Mar 15, 2013, 09:48 pm
Common +, green is + and red is + and gnd is gnd, so common anode.

#### i_luv_arduino

#20
##### Mar 16, 2013, 01:18 am
sorry to switch colours is  + so I guess is cathode, or maybe your diagrams are mixed up... )

#### i_luv_arduino

#21
##### Mar 16, 2013, 01:53 am
Now half of it isnt working and it is green and yellow and orange, could the leds be burnt from 5v?

#### i_luv_arduino

#22
##### Mar 16, 2013, 01:55 am
Never mind now it all works but one side is green other is red>  :0

#### i_luv_arduino

#23
##### Mar 16, 2013, 02:46 am
Ok now I got the program running it is random, and at the "SPACE" at the end it is supposed to be clear but there is two lines left.  :~

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